CN101915784B - Indoor photothermal effect test system and test method for road materials - Google Patents

Abstract

The invention relates to an indoor photothermal effect test system and test method for roads, which belong to the technical field of material test. It solves the problem that the way to obtain the photothermal response of various pavement materials at the present stage is restricted by natural conditions and the problem of low efficiency. On the base of the device of the present invention, the test material test bench and the contrast material test bench are fixed, the light frame is fixed on the base, and two sets of lighting devices are distributed on the light frame. The illumination of same condition is provided, and the temperature acquisition device is used to detect the temperature value of test material and reference material simultaneously; Two pyranometers are used to collect the illumination radiation intensity of the pavement material on two experimental platforms respectively; The inventive method at first will pave the pavement material; then adjust the lighting device so that the light radiation intensity obtained on the two pavement materials is the same and continue to irradiate for seven hours, while collecting the temperature of the pavement material; finally output the data. The invention is used for photothermal effect test of road materials.

Description

Road indoor photothermal effect test system and test method

technical field

The invention relates to an indoor photothermal effect test system and test method for roads, belonging to the technical field of material testing.

Background technique

At present, the acquisition of the photothermal response of various pavement materials under solar radiation is mostly carried out by paving test roads outdoors and then embedding sensors. This method is restricted by natural weather and geographical conditions. Since the test needs to be carried out on a sunny day, if it encounters a long period of cloudy weather, it will affect the efficiency of the test; due to the poor reproducibility of natural weather and geographical conditions, the obtained data In addition, a day and night cycle of this kind of experiment takes 24 hours. If a research cycle is completed, it will not only take a long time, but also set up data collection outdoors, which will cause many inconveniences to equipment maintenance and debugging.

Contents of the invention

The purpose of the present invention is to provide an indoor photothermal effect test system and test method for road use in order to solve the problem that the way to obtain the photothermal response of various pavement materials is restricted by natural conditions and low in efficiency at the present stage.

The road-use indoor photothermal effect test system of the present invention includes a base, a test material test bench, a control material test bench, a temperature acquisition device, a lamp stand, two sets of lighting devices and two radiometers,

The test material test bench and the control material test bench are fixed on the upper surface of the base, the light frame is fixed on the base, and two sets of lighting devices are distributed on the light frame. Illumination under the same conditions, the temperature acquisition device is used to simultaneously detect the temperature values of the test material and the control material;

The two pyranometers are respectively used to collect the light radiation intensity of the pavement material on the test material test bench and the pavement material on the control material test bench.

The indoor photothermal effect test method for roads based on the above-mentioned device of the present invention comprises the following steps:

Step 1: paving the pavement material to be tested on the test material test bench; paving the reference pavement material on the control material test bench;

Step 2: Adjust the overall height of the light stand so that the two sets of lighting devices are in a horizontal state, and adjust the elevation angles of the two sets of lighting devices so that the light emitted by the two sets of lighting devices is evenly irradiated on the test material test bench and the control material test bench At the same time, adjust the light intensity emitted by each set of lighting devices, so that the light radiation intensity obtained by the two test bench pavement materials collected by the two pyranometers is the same;

Step 3: Make the irradiation time of the lighting device last for seven hours;

At the same time, the temperature of the pavement materials on the two test benches is collected from time to time by the temperature collection device;

Step 4: After the light is finished, output the temperature data obtained by the temperature acquisition device to the computer, and analyze and obtain the photothermal effect data of the pavement material.

The advantages of the present invention are: the present invention realizes the indoor simulation of the situation of pavement materials receiving sunlight radiation outdoors, and facilitates the evaluation of the photothermal effect response of various pavement materials, because the indoor conditions are not restricted by the external natural conditions , the key parameters can be conveniently controlled by humans, which greatly improves the experimental efficiency, and at the same time, the reproducibility and controllability of the experiment are good.

Experiments have proved that using the test system of the present invention to measure the pavement material, it only takes seven hours to make the pavement material to be tested reach a thermal equilibrium state, which greatly shortens the research period for the photothermal effect of the pavement material;

Compared with paving test roads outdoors, the present invention only needs to prepare test pieces for each pavement material and place them on the test bench, and the operation is simple.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the side view of Fig. 1;

Fig. 3 is the top view of Fig. 1;

Fig. 4 is the schematic diagram of the implementation principle of the system of the present invention;

Fig. 5 is a schematic diagram of the structure of nine uniformly distributed points on the test material or the control material.

Detailed ways

Specific Embodiment 1: The present embodiment will be described below in conjunction with Fig. 1 to Fig. 4. The indoor photothermal effect test system for roads described in this embodiment includes a base 1, a test material test bench 2, a control material test bench 3, a temperature acquisition device 4, Lamp stand 5, two sets of illumination devices 6 and two pyranometers,

The test material test bench 2 and the control material test bench 3 are fixed on the upper surface of the base 1, the lamp stand 5 is fixed on the base 1, and two sets of lighting devices 6 are distributed on the light stand 5, the test material test bench 2 and the control material test bench 3 A set of illumination devices 6 respectively provide illumination under the same conditions, and the temperature acquisition device 4 is used to simultaneously detect the temperature values of the test material and the reference material;

The two radiometers are respectively used to collect the light radiation intensity of the pavement material on the experimental platform 2 of the test material and the pavement material on the experimental platform 3 of the control material.

Specific embodiment two: the present embodiment will be described below in conjunction with Fig. 1 to Fig. 3, and the difference between this embodiment and embodiment one is that it also includes two heat-insulating enclosures 7, and the outside of the test material test bench 2 Cover a heat-insulating sheath 7, so that only the upper surface of the test material test bench 2 is exposed to the outside; a heat-insulation sheath 7 is placed on the outside of the control material test bench 3, so that only the upper surface of the contrast material test bench 3 is exposed outside. Other components and connections are the same as those in Embodiment 1.

The outer surfaces of the two test benches are respectively covered with heat-insulating sheaths 7 to prevent the temperature field from being disturbed by other external factors, and to prevent heat loss from the surrounding and bottom surfaces of the test bench, thereby affecting the test results , materials such as thermal insulation fibers can be filled in the heat insulation enclosure sheath 7, which is conducive to improving the heat insulation measures for the test piece.

Specific embodiment three: this embodiment is a further limitation to embodiment two, the temperature acquisition device 4 is composed of a first temperature sensor, a second temperature sensor and a data collector,

The first temperature sensor is used to detect the temperature of the pavement material on the test material test bench 2, and the temperature signal output end of the first temperature sensor is connected to the test material temperature signal input end of the data collector;

The second temperature sensor is used to detect the temperature of the pavement material on the control material test bench 3, and the temperature signal output end of the second temperature sensor is connected to the control material temperature signal input end of the data collector.

The temperature sensor can be installed on the surface or inside of the pavement material to be tested to accurately measure the temperature of the pavement material. After outputting to the computer, the temperature data can be automatically collected and recorded by special software for analysis.

Specific Embodiment 4: The present embodiment will be described below with reference to FIGS. 1 to 3. This embodiment is a further limitation of Embodiment 3. The lamp stand 5 consists of five columns 5-1, hangers 5-2, and eight Fine-tuning suspension rod 5-3 and eight fixed suspension rods 5-4 form,

Each column 5-1 is fixed by welding with the base 1, and the outer surfaces of the five columns 5-1 are threaded structures. There is a height adjustment screw 5-11 on each column 5-1, and the height adjustment Screw 5-11 is threadedly connected with column 5-1, and hanger 5-2 is positioned on five columns 5-1, and is held up by height adjustment screw 5-11 on each column 5-1; Described hanger 5 -2 is a rectangular structure, and the five uprights 5-1 are respectively located at the positions of the four vertices and the central point of the hanger 5-2;

Each set of lighting device 6 is composed of four iodine-tungsten lamps 6-1, and each iodine-tungsten lamp 6-1 is suspended on the hanger 5-2 through a fine-tuning suspender 5-3 and a fixed suspender 5-4 , the four iodine-tungsten lamps 6-1 in each set of illumination devices 6 are evenly distributed relative to the experimental bench that provides illumination, so as to form illumination under the same conditions.

The lighting device 6 in this embodiment is the core part of the present invention, and each iodine-tungsten lamp 6-1 is suspended on the hanger 5-2 by means of a fixed suspender 5-4 and a fine-tuning suspender 5-3. The fine-tuning suspender 5-3 can be a screw rod, which adjusts the length of its effective suspension part through screws, and then adjusts the elevation angle of the iodine-tungsten lamp 6-1 to achieve the purpose of light intensity fine-tuning. A total of eight iodine-tungsten lamps 6-1 are hung on the hanger 5-2, and every four iodine-tungsten lamps 6-1 form a set of lighting device 6, which provides illumination for a test bench under it. The threaded structure outer surface of column 5-1 is beneficial to adjust the overall height of hanger 5-2 and adjust its horizontal state by the height adjustment screw 5-11 that has on it.

Specific embodiment five: the present embodiment is described below in conjunction with Fig. 5, and present embodiment is the further limitation to embodiment 4, and described a pyranometer is used for collecting the light intensity at nine light intensity collection points in the upper surface of the test material experimental bench 2. Illumination radiation intensity; the nine light intensity collection points are evenly distributed; another radiometer is used to collect the illumination radiation intensity at nine light intensity collection points in the upper surface of the contrast material test bench 3, and the nine light intensity collection points Evenly distributed.

Specific Embodiment Six: The present embodiment will be described below in conjunction with FIG. 4 . The difference between this embodiment and Embodiments 1, 2, 3, 4 or 5 is that it also includes a regulated power supply,

The stabilized power supply is used to supply power to the lighting device 6 . Other compositions and connections are the same as those in Embodiments 1, 2, 3, 4 or 5.

Using a stabilized power supply to supply power to each iodine-tungsten lamp 6-1 in the lighting device 6 can ensure a stable power supply voltage so that the iodine-tungsten lamp 6-1 can maintain a stable light intensity.

The present invention has wide applicability, retains the stabilized power supply and the lighting device 6 of the system, and replaces the data acquisition equipment or other equipment to obtain the response of other physical states of the pavement material under solar radiation.

The device of the present invention is not limited to the above-mentioned embodiments, and may also be a reasonable combination of the technical features described in the above-mentioned embodiments.

Specific embodiment seven: This embodiment is a road-use indoor photothermal effect test method based on the device described in embodiment one, which includes the following steps:

Step 1: laying the pavement material to be tested on the test material test bench 2; laying the contrast pavement material on the control material test bench 3;

Step 2: Adjust the overall height of the light stand 5 so that the two sets of lighting devices 6 are in a horizontal state, and adjust the elevation angles of the two sets of lighting devices 6 so that the light emitted by the two sets of lighting devices 6 is evenly irradiated on the test material test bench 2 And on the control material test bench 3, adjust the light intensity sent by each set of lighting devices 6 at the same time, so that the illumination radiation intensity obtained by the pavement materials on the two test benches collected by the two pyranometers is the same;

Step 3: Make the irradiation time of the lighting device 6 last for seven hours;

Simultaneously, the temperature of the pavement material on the two test benches is collected from time to time by the temperature collection device 4;

Step 4: After the light is finished, output the temperature data obtained by the temperature acquisition device 4 to the computer, and analyze and obtain the photothermal effect data of the pavement material.

The determination method of illumination time, intensity and uniformity:

The light source radiation intensity of illumination device 6 is a constant value among the present invention, and the setting value in step 2 of the present invention is selected as outdoor asphalt pavement under sunlight radiation, the illumination radiation intensity value that the ground reaches at 14 o'clock in the afternoon. Because the intensity of solar radiation is a cosine change, it is necessary to integrate the change to obtain the total radiation of the sun. It has been verified by experiments that the pavement material is tested for photothermal effect by using the present invention. Under the irradiation of the radiation intensity of the fixed light source, only about seven The total solar radiation received by the ground in the outdoor environment for a day and night can be reached within an hour, and the thermal equilibrium state can be reached.

In order to make the indoor test results have a good correlation with the outdoor actual results, the present invention needs to adopt the method of the equivalent radiant heat principle when the present invention is implemented, that is, when the cumulative heat projected by the lighting device 6 under constant radiation intensity in the room is the same as that in the outdoor When the asphalt pavement reaches thermal equilibrium under solar radiation and the accumulated heat of sunlight projected onto the pavement is equal, the temperature value obtained from the indoor test can be approximated as the outdoor thermal equilibrium temperature.

Embodiment 8: This embodiment is a further limitation to Embodiment 1. The illumination radiation intensity obtained by the pavement materials on the two test benches collected by the two radiometers is the same as described in step 2. The light radiation intensities obtained by the pavement materials on the two test benches are collected by two pyranometers, so that the light radiation intensities at nine uniformly distributed light intensity collection points on the pavement materials meet the following conditions:

Formula one: $\left|\frac{W_{\mathrm{ij}}-{\stackrel{\‾}{W}}_i}{{\stackrel{\‾}{W}}_i}\right|\≤5\%;$

Formula two: $\left|\frac{{\stackrel{\‾}{W}}_i-\stackrel{\‾}{W}}{\stackrel{\‾}{W}}\right|\≤5\%;$

-表示i实验台上的平均辐射强度，单位为W/m²；i取值为1，2，分别代表试验材料实验台2和对照材料实验台3；In the formula:

- Indicates the average radiation intensity on the test bench i, in W/m ² ; the values of i are 1 and 2, respectively representing the test material bench 2 and the control material bench 3;

W _{ij -} represents the radiation intensity at position j of test bench i, and the unit is W/m ² ; the value of j is 1, 2, ..., 9, which respectively represent 9 light intensity collection points on each test bench;

-表示两实验台的平均辐射强度值的均值；

- represents the mean value of the average radiation intensity values of the two test benches;

此公式中i取值为1。Formula three:

The value of i in this formula is 1.

When the method of the present invention is in use, the illumination intensity and uniformity of the test material and the reference material are measured by a pyranometer, and the control of the illumination intensity and uniformity is realized by adjusting the height and elevation angle of the illumination device 6 . In the method of the present invention, the parameters of the two test benches subjected to optical radiation should be completely the same in theory, but in actual conditions, it is difficult to do so. Use a pyranometer to measure the illumination radiation intensity of 9 uniformly distributed positions on each test bench. If the measurement results do not meet the conditions of formula 1 to formula 3, it is necessary to readjust the radiation elevation angle of the illumination device 6 and the positions between the various light sources. , until the above requirements are met.

The present invention measures the parameters on the road surface and controls them to satisfy the formulas 1 to 3, so that the data measured by the two test benches have relatively good parallelism. Among them, formula 1 is used to control the radiation uniformity of a single test bench; formula 2 and formula 3 are used to control the parallelism of radiation uniformity between two test benches.

Claims (7)

1. An indoor photothermal effect test system for road use, It includes a base (1), a test bench for test materials (2), a test bench for control materials (3), a temperature collection device (4), a light stand (5), two sets of lighting devices (6) and two pyranometers, The upper surface of the base (1) is fixed with the experimental table for test materials (2) and the experimental table for reference materials (3), the lamp stand (5) is fixed on the base (1), and two sets of lighting devices ( 6), the test material test bench (2) and the control material test bench (3) are respectively provided with a set of lighting devices (6) with the same light conditions, and the temperature acquisition device (4) is used to detect the test materials and control materials at the same time temperature value; Two pyranometers are used to collect the light radiation intensity of the pavement material on the test material test bench (2) and the pavement material on the contrast material test bench (3) respectively; It is characterized by: It also includes two heat-insulating sheaths (7), and a heat-insulating sheath (7) is placed on the outside of the test material test bench (2), so that only the upper surface of the test material test bench (2) is exposed to the Outside: a thermal insulation sheath (7) is placed on the outside of the control material test bench (3), so that only the upper surface of the control material test stand (3) is exposed to the outside. 2. The road-use indoor photothermal effect test system according to claim 1, characterized in that: The temperature acquisition device (4) is made up of a first temperature sensor, a second temperature sensor and a data collector, The first temperature sensor is used to detect the temperature of the pavement material on the test material test bench (2), and the temperature signal output end of the first temperature sensor is connected to the test material temperature signal input end of the data collector; The second temperature sensor is used to detect the temperature of the pavement material on the control material test bench (3), and the temperature signal output end of the second temperature sensor is connected to the control material temperature signal input end of the data collector. 3. The road-use indoor photothermal effect test system according to claim 2, characterized in that: The lamp stand (5) is composed of five uprights (5-1), a hanger (5-2), eight fine-tuning suspenders (5-3) and eight fixed suspenders (5-4), Each column (5-1) is fixed to the base (1) by welding, the outer surfaces of the five columns (5-1) are threaded, and each column (5-1) has a height adjustment screw (5-11), the height adjustment screw (5-11) is threadedly connected with the column (5-1), and the hanger (5-2) is positioned on five columns (5-1), and each column ( The height adjustment screw (5-11) on 5-1) is held up; the hanger (5-2) is a rectangular structure, and the five columns (5-1) are respectively located at the four vertices of the hanger (5-2) and the location of the center point; Each set of lighting device (6) is made up of four iodine tungsten lamps (6-1), and each iodine tungsten lamp (6-1) passes through a fine-tuning suspension rod (5-3) and a fixed suspension rod (5-4 ) is hung on the hanger (5-2), and the four iodine-tungsten lamps (6-1) in each set of lighting devices (6) are evenly distributed relative to the experimental bench that provides lighting, so as to form lighting under the same conditions. 4. The road-use indoor photothermal effect test system according to claim 3, characterized in that: The one radiometer is used to collect the illumination radiation intensity at nine light intensity collection points on the upper surface of the test material test bench (2); the nine light intensity collection points are evenly distributed; the other radiometer is used to collect contrast materials The light radiation intensity at the nine light intensity collection points on the upper surface of the test bench (3), where the nine light intensity collection points are evenly distributed. 5. The road-use indoor photothermal effect test system according to claim 1, 2, 3 or 4, characterized in that it also includes a stabilized power supply, The stabilized power supply is used to supply power to the lighting device (6). 6. A road indoor photothermal effect test method based on the road indoor photothermal effect test system according to claim 1, characterized in that: it comprises the following steps: Step 1: laying the pavement material to be tested on the test material test stand (2); laying the contrast pavement material on the control material test stand (3); Step 2: Adjust the overall height of the light stand (5) so that the two sets of lighting devices (6) are in a horizontal state, and adjust the elevation angles of the two sets of lighting devices (6), so that the light emitted by the two sets of lighting devices (6) are respectively Evenly irradiate on the test material test bench (2) and the control material test bench (3), and adjust the light intensity emitted by each set of lighting devices (6) at the same time, so that the two test benches collected by the two pyranometers The intensity of light radiation obtained by pavement materials is the same; Step 3: Make the irradiation time of the lighting device (6) last for seven hours; Simultaneously, the temperature of the pavement material on the two test benches is collected from time to time by the temperature collection device (4); Step 4: After the light is finished, output the temperature data obtained by the temperature acquisition device (4) to the computer, and analyze and obtain the photothermal effect data of the pavement material. 7. The indoor photothermal effect test method for roads according to claim 6, characterized in that: said in step 2, the intensity of illumination radiation obtained by the pavement materials on the two test benches collected by two pyranometers is characterized in that: The same means that two pyranometers are used to collect the light radiation intensities obtained by the pavement materials on the two test benches, so that the light radiation intensities at nine uniformly distributed light intensity collection points on the pavement materials meet the following conditions : Formula one: $\left|\frac{W_{\mathrm{ij}}-{\stackrel{\‾}{W}}_i}{{\stackrel{\‾}{W}}_i}\right|\≤5\%;$ Formula two: $\left|\frac{{\stackrel{\‾}{W}}_i-\stackrel{\‾}{W}}{\stackrel{\‾}{W}}\right|\≤5\%;$ In the formula:

- represents the average radiation intensity on the i test bench, in W/m ² ; the value of i is 1, 2, representing the test material bench (2) and the reference material bench (3) respectively; W _ij - indicates the radiation intensity at position j of test bench i, in W/m ² ; the value of j is 1, 2, ..., 9, which respectively represent 9 light intensity collection points on each test bench; - represents the mean value of the average radiation intensity values of the two test benches; Formula three:

The value of i in this formula is 1.

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